Adidas By Stella McCartney fans rejoice: we've found the perfect workout companion in the Studio Recycled Polyester Sports Bag (£140). Want to know why we rate it so high? Well, for one, the bag is crafted from recycled materials and features a minimalistic design. This makes it perfect if you aren't into loud colours and slogans, just the subtle Adidas By Stella McCartney branding. Second, it's huge. You'll be able to fit your entire gym kit inside. In fact, there's so much space that you could probably fit two gym kits inside. However, its size does mean that not everyone will love you on that early morning commute on the tube.